METHOD AND APPARATUS FOR HIGH-SPEED DATA TRANSFER EMPLOYING SELF-SYNCHRONIZING QUADRATURE AMPLITUDE MODULATION

    公开(公告)号:US20170237598A1

    公开(公告)日:2017-08-17

    申请号:US15425785

    申请日:2017-02-06

    Applicant: SeeScan Inc.

    CPC classification number: H04L27/362 H04L27/3455 H04L27/3818

    Abstract: Methods and apparatus for wired communications are disclosed. A method for transmitting a data stream through a wired communications channel includes encoding the data stream to produce a first baseband modulating signal I(t) and a second baseband modulating signal Q(t) whose amplitudes together represent a time series of complex symbols (I, Q) each selected from a two-dimensional (2-D) constellation of symbols distributed on the phase plane about the origin such that at least one of the baseband modulating signals has a substantially non-zero mean amplitude, modulating the baseband signals I(t) and Q(t) to produce a modulated signal, wherein the I(t) and Q(t) components of the modulated signals are generally fixed in quadrature, and providing the modulated signal to a wired communications channel.

    Input multiplexed signal processing apparatus and methods

    公开(公告)号:US11901642B1

    公开(公告)日:2024-02-13

    申请号:US17531533

    申请日:2021-11-19

    Applicant: SeeScan, Inc.

    CPC classification number: H01Q23/00 H01Q1/243 H01Q1/521 H01Q7/06

    Abstract: Front end circuits and associated apparatus, systems, and methods for use in electronic devices such as buried utility locators are disclosed. The circuits include receivers and filters on input signals that are coupled to ground rather than differentially. A multiplexing circuit allows shared use of amplifiers, and analog-to-digital converters via a switching mechanism for selectively making or breaking electrical connection to the receiver channels for efficient sharing of electronics resources while minimizing crosstalk interference and advantageously reducing costs.

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